Effect of turbulence and IR radiation on the thermal conditions of the earth thermosphere

Physics

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Atmospheric Heat Budget, Earth Atmosphere, Infrared Radiation, Radiation Effects, Thermosphere, Turbulence Effects, Atmospheric Heating, Atmospheric Models, Atmospheric Temperature, Atmospheric Turbulence, Carbon Dioxide, Energy Dissipation, Temperature Profiles, Turbulent Heat Transfer

Scientific paper

A theoretical thermospheric model which accounts for the various energy inputs and outputs is used to investigate the roles of IR radiation, turbulent heat conduction, and turbulent energy dissipation in the heat balance. The maximum turbulent heat conduction coefficient in the lower thermosphere is estimated at (1-2) x 10 to the 6th sq cm/s. Good agreement is obtained between theoretical and empirical vertical profiles of gas temperature and viscous dissipation rates of turbulent energy. It is also found that energy dissipation in the lower thermosphere is due mainly to IR radiation in the 15 micron CO2 band, rather than to turbulence.

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